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Science 2 March 2001:
Vol. 291. no. 5509, pp. 1759 - 1762
DOI: 10.1126/science.1056986
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Reports

Spins in the Vortices of a High-Temperature Superconductor

B. Lake,1 G. Aeppli,23* K. N. Clausen,3 D. F. McMorrow,3 K. Lefmann,3 N. E. Hussey,45dagger N. Mangkorntong,4 M. Nohara,4 H. Takagi,4 T. E. Mason,1 A. Schröder6

Neutron scattering is used to characterize the magnetism of the vortices for the optimally doped high-temperature superconductor La2-xSrxCuO4 (x = 0.163) in an applied magnetic field. As temperature is reduced, low-frequency spin fluctuations first disappear with the loss of vortex mobility, but then reappear. We find that the vortex state can be regarded as an inhomogeneous mixture of a superconducting spin fluid and a material containing a nearly ordered antiferromagnet. These experiments show that as for many other properties of cuprate superconductors, the important underlying microscopic forces are magnetic.

1 Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
2 N.E.C. Research, 4 Independence Way, Princeton, NJ 08540, USA.
3 Department of Condensed Matter Physics and Chemistry, Risø National Laboratory, 4000 Roskilde, Denmark.
4 Department of Advanced Material Science, Graduate School of Frontier Sciences, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan.
5 Department of Physics, University of Loughborough, Loughborough, LE11 3TU, UK.
6 Physikalisches Institute, University of Karlsruhe, D-76128 Karlsruhe, Germany.
*   To whom correspondence should be addressed. E-mail: gabe{at}research.nj.nec.com

dagger    Present address: H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.

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